How do I add color REGIONS/variations in for the Megapithicus or other dinos?

I’m trying to make a mod that will add in balanced Gorillas in the overworld that can be tamed. I was trying to figure out how to make it so he can have seperate colors. Apparently, by default it does not support alternative colors, I enabled colorization for it and gave it a custom color set, but all the gorillas I spawn in end up as white and settargetdinocolor does nothing to it.

I’m thinking I have to edit one of the meshes or textures in order to allow color regions. Problem is, I looked through a couple of the materials and textures for it but I can’t figure out how to make new color regions.